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    <script>
        // 1. Object.is  判断两个值是否完全相等 
        console.log(Object.is(120, 120));//true
        console.log(Object.is(NaN, NaN));//true
        console.log(NaN === NaN);//false
        // 2.Object.assign(a,b)  对象的合并 第一个参数为模板，第二个参数为覆盖的内容 b覆盖a
        const config1 = {
            host: 'localhost',
            port: 3306,
            name: 'root',
            pass: 'root',
            test: 'test'
        }
        const config2 = {
            host: 'https://baidu.com',
            port: 3366,
            name: 'baidu',
            pass: 'baidu'
        }
        console.log(Object.assign(config1, config2));
        // host: "https://baidu.com"
        // name: "baidu"
        // pass: "baidu"
        // port: 3366
        // test: "test"

        // 3. Object.setPrototypeOf 设置原型对象 | Object.getPrototypeOf 获取原型对象
        const school = {
            name:"清华"
        }
        const cities = {
            area:['北京','上海','深圳']
        }
        Object.setPrototypeOf(school,cities);
        console.log(school);
        console.log(Object.getPrototypeOf(school));
    </script>
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